Uses CSMA/CD – Carrier Sense Multiple Access/Collision Detection
All computers share a single network segment
Every computer listens on the network segment
If no other computer is transmitting at that time, then the computer can transmit data
If two computers send data at the same time, then a collision occurs. Both computers sense the conflict, and stop sending. They wait a “random” amount of time (in nanoseconds), then retransmits the data.